Carbureter



c. v. ELLIOTT.

CARBURETER.

APPLICATIQN FILED MAY 13, 1919.

Patented Apr. 6, 1920.

K 2 7 MW il ldv 3 E F N WM l/VVE/VTOR BY ATTORNEYS WITNESSES cmannoa v. nntro'rr, or BATON ROUGE, Louisiana.

CAEBURET'ER.

Application filed May 13, 1919.

To all whom it may concern:

Be it known that I CLARENCE V. ELLIOTT, a citizen of the United States, and a resident of Baton Rouge, in the parish of East Baton Rouge and State of- Louisiana, have invented certain new and useful Improvements in Garbureters, of which the following is a specification.

This invention relates to carbureters, and particularly to means for controlling'the feed of fuel to the carbureter.

It is oftentimes desirable, particularly in the carbureters of tractors, that the height of the fuel level be increased when the tractor is traveling on an incline. This is of course true of automobiles, though not to the same extent. Carbureters were provided with means for pulling or pushing down the float so as to hold the inlet valve open when the float would ordinarily close it. These devices were open to'the objection however that they were positive in their action, and held the inlet valve open without regard to the rise of fuel in the bowl ofthe carbureter. The valve was held open so long as pressure was maintained on it,and

either the bowl overflowed with a consequent flooding of the engine, or else the device was entirely out of operation.

lVith these facts in mind, the general object of my invention is to provide manually controlled means whereby the inlet valve of a carburetor may be depressed but, additionally, to provide means causing the automatic closing of the valve before the carbureter can overflow.

A further object is toprovide means whereby a yielding pressure may be exerted on the float to yieldingly hold the float down below itsnormal point of buoyancy, but which-when the liquid has risen to a predetermined point will permit the float to rise and close the inlet valve.

A further object is to provide means for yieldingly. resisting the upward movement of the float, which means shall be of such character that the degree of such resistance may be delicately regulated and controlled, and'which further is of such character that it may be kept in operation forany length of time required, and instantly thrown out of operation.

Other objects will appear in the following description.

Specification of Letters Patent.

Patented Apr. 6, 1920.

Serial No. 296,889.

In the accompanying drawings Figure 1 is a side elevation ofv an-ordinary type of carbureter, partly in section, and showing one form of my invention applied thereto.

Fig. 2 is a top plan view of the carbureter bowl, shown in Fig. 1. p

Fig. 3 is a verticalsection of a carburetor bowl, showing another embodiment of my invention.

In Fig. 1 10 designates the float bowl of the carburetor, having an outlet..11 to the usual mixing chamber or duct 12 passage through which is controlled by the throttle valve 13. The cap 14 of the bowl has an inlet duct 15 formed to provide a valve seat 16. A valve 17 operates in the duct and co-acts with seat 16. This valve is held to its seat by a float 18 shown as having an arm 19 pivoted to the ear 20,'the arm having a socket within which'rests the lower end of valve 17. The parts above described are such as may be ordinarily found in standard carbureters.

To carry out the objects of my invention,

I provide a torsion spring in the form of a i light resilient rod or wire 21 which extends down through an inclined passage in cap 14 and is angularly bent at 22, and has its eX- hicle. The shank 2 1 carries a washer 26 bearing against a cotter pin 27 and urged against the pin by a spring 28, in turn hearing against the bearing 25. Thus there is sufficient resistance to rotation of the shank 24as to hold the shank in any position to which it may be adjusted by the handle 29 on the shank. The pointer on the handle coacts with the dial to indicate the pressure exerted on the float 18.

The operation of this form of my inven- 1 tion is as follows :wa indicates the normal level of fuel in the bowl 10. If the level falls below this the float descends opening the valve and allowing the inlet of fuel until the float again rises to its normal more fuel to run into the bowl.

position. The wire or rod 21 is of such diameter as'to act as a torsion sprlng capable of a considerable amount of distortion without a corresponding increase of force being exerted by arm 22. By giving a small amount of rotation to the wire 21 the arm 22 will move downward, depressing the float 18 slightly, and therefore allowing The fuel as it rises higher in the bowl 10 exerts a constantly increasing force on the float, until eventually this upward force on the float is sufficient to overcome the torsional resistance of the rod or wire 21, and the float rises and closes the valve. This super-normal level is indicated by the line 6-6 in Fig. I. So long as the wire 21 is held turned to this degree the new or super-normal level will be maintained. The greater the twist given to the wire the greater will be the resistance to the rise of the float and the higher the fuel will rise in the bowl.

The wire 21 is of smalldiameter and of relatively considerable length usually two or more feet, and, as before stated acts as a spring and it must not be very stifl'as if it were a very slight rotation of 29, would exert so much pressure on the float, that the increased-fuel pressure would not be sufficient to overcome the force of the. spring and close the valve 17 In Fig. 3, I show another embodiment of my invention wherein 31 denotes the carbureter bowl, and 32 the inlet port con- .trolled by a valve 33, carried by a stem 34.

Surrounding the stem 34 and movable vertically thereon is a float 35. The stem 34 carries a grooved collar, 36 with which engage the inner ends of weighted levers 37. The bowl 31 has the usual outlet to the mixin chamber.

ounted on stem 33 is-a collar 38 held by a set screw 39, and engaging therewith is one arm of a bell-crank lever 39. From the other arm extends a pull connection '40 which has in its length a contractile spring 41. The wire forming connection 40, extends to a suitable handle 41. The handle 40 may be either turned to increase the tension of spring 41, or it might be shifted longitudinally to thereby increase the tension. When the spring 41 has its tension increased it will urge the horizontal arm of the lever 39 upward, thus any upward movement of the float will be resisted byi-he spring, through the levels 37 Thus-a twist or rotative movement of handle 41. will act to raise thearm of lever 39 against collar 38 ,and raise the valve from its seat-which the float resists.

With only a slight .turn (or pull) of handle 41 there will only be a slight tendency to lift the. valve and consequently only a slight increase in the fuel level. By-a greater movement causing a correspondingly increased tension on the spring 41, the fuel level will be raised a correspon ingly greater amount.

In both of the constructions illustrated,

- by the float, in such manner as to open or tend to open the valve and allow more fuel to run into the float chamber. This increased quantity of fuel in the bowl exerts increased force to close the valve against the force of the spring resisting such closure. The rcsultds that when the forceresisting closing ofthe valve is overcome, the valve will close and when equilibrium is established the fuel will stand at a higher level in the bowl than before the resistance was applied or increased.

\Vhile I have illustrated only two forms of my invention, these are purely illustrative and it is obvious that many changes might be made in the construction shown and that the principle of theinvention might 'be embodied in many different forms With-- 1 controlled valve controlling passage through the inlet, and mechanical means adjustably automatically yieldingly resisting the closing ofthe valve under the action of the float.

2. A receptacle having an inlet, a float controlledvalve controlling passage through the inlet, and mechanical means, shiftable into or out of operation, and when in operation automatically yieldingly resisting the closing of the valve under the action of the float.

3. A receptacle having an inlet, a float controlled valve controlling passage through the inlet, and mechanical means, shiftable into or' out of operation, and when in operclosing of the valve under the action of the float, said means being ad ustable to increase or decrease the degree of resistance.

4. A receptacle having an inlet, a valve ation automatically yieldingly resisting. the

thereto, a resilient-element, manually shiftable into position to automatically resiliently resist the upward movement of the float, and means for .adjustably increasing or decreasing the resilient'resistance of the element.

A carbureter having a bowl and inlet thereto a valve controlling the-inlet, a float therein operatively engaging the valve to close it upon a'predetermined elevation of the float and manually adjustable means for variably automatically resiliently resisting the upward movement of the float. 1

8. A carbureter having a bowl and inlet thereto, a valve controlling the inlet, a float therein operatively engaging the valve to close it upon a predetermined elevation of the float and manually adjustable means for variably resisting the upward movement of e the float, including a torsion spring and means for increasing or decreasing the torsion of the spring.

the float, and manually adjustable means for variably resisting the upward movement of the'float, includmg a torsion spring 0per-, atively engaged at one endwith the valve and means whereby the other end of the spring may be rotated to adjust the torsional resistance of the spring.

10. A carbureter having a bowl, an inner valve therefor, a float operatively engaged with the valve to close it upon thearrival of the float at a normal predetermined eleva- 1 tion, and manually adjustable means tor variably automatically resiliently resisting movement of the float to control the height to which liquid shall .rise in the bowl before the valve closes.

CLARENCE v. ELLIOTT. 

